Not sure where to put this. But I was surprised to note that our closest relatives, the Bonobo ape, regularly use sex as a way to diffuse arguements
Especially between female bonobos. There are loads of videos of them doing a missionary style aggressive tribbing to resolve disputes and communicate.
And are female led in hierachy.
Just to highlight it might be somewhere hard wired into our genes, as we share nearly 99% of dna with them.